Hi Bob:
Not sure you could see a slight frequency shift of a few hertz with a
scope. Unless it was accompanied by an amplitude abberation.
Does the PTO in question have the ground jumper braid to the shaft slider?
See the WB4 HFN site for info on this if not.
Curt
On 10/26/2011 9:32 AM, Robert Fish wrote:
Hi Guys,
I have been ignoring an issue with my T-4XC until recently. When I use
the R-4C PTO to control the receiver it seems to work fine.
When I use the T-4XC PTO to control the receiver I get sort of a
chirpy, jumping around of the cw signal I am trying to copy. Both units
work fine in transceive using the R-4C PTO, which is the way I have
been using them. But with the recent DX expeditions (T32C, TX7M)
running split, I have been having to use the C-line as separates to
work them. I have had some success working them, but heaven knows what
my signal sounds like.
I have been putting off fixing this problem as I felt it was probably
the PTO and I haven't been in the mood for performing major surgery
lately.
I decided to get off my arse and do something about it yesterday. So,
I got out the scope and took a look at the T-4XC PTO output while it
was controlling the R-4C.
It seems stable. So I looked at the Plate of V-8 with the scope, I
have a composite signal (PTO, Xtal Osc.) it looks solid as a rock. So
then I looked at the injection signal
right at the jack on the back of the T-4XC and once again, I can hear
a cw signal I tuned in on the R-4C jumping all over the place, while
I'm looking at a rock solid injection sig
leaving the T-4XC. I switch back to the R-4C PTO and the jumping
around stops, the receiver copies the same cw sig with stability.
What am I missing here? It is hard to fix something when it seems like
the only evidence of a problem is coming out of the speaker. If I
could find some evidence of the problem
I could follow it to it's source. This could be operator error
(probably is) I only put about an hour in to this last night as I got
called to dinner and a man has to have priorities.
I am going to dig in to it this morning, I will eventually find the
problem, but maybe you guys can save me some time.
Oh........another clue: When I use the spot function, in CW mode, I
get a warbling sound in the R-4C instead of a solid cw tone when
tuning in the T-4XC sig with the receiver. It seems
sort of intermittant (it switches to a cw tone sometimes and then goes
back to warbling like you get in SSB mode with the spot function.)
Thanks in advance, I hope this long winded post made sense.
Bob K6GGO
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